91 lines
1.8 KiB
Go
91 lines
1.8 KiB
Go
/*
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* Copyright 2026 Oleg Borodin <onborodin@gmail.com>
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*
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* This work is published and licensed under a Creative Commons
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* Attribution-NonCommercial-NoDerivatives 4.0 International License.
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*
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* Distribution of this work is permitted, but commercial use and
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* modifications are strictly prohibited.
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*/
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package logger
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import (
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"bytes"
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"fmt"
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"io"
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"os"
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"sync"
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"time"
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)
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var (
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mtx sync.Mutex
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output io.WriteCloser = os.Stderr
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)
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type Logger struct {
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subject string
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writer io.WriteCloser
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mtx *sync.Mutex
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}
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func NewLogger(subj string) *Logger {
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return &Logger{
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subject: subj,
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writer: output,
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mtx: &mtx,
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}
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}
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func NewUnamedLogger() *Logger {
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return &Logger{
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writer: output,
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mtx: &mtx,
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}
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}
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func SetWriter(newOut io.WriteCloser) {
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mtx.Lock()
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output = newOut
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mtx.Unlock()
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}
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func (logg *Logger) SetWriter(newOut io.WriteCloser) {
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mtx.Lock()
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logg.writer = newOut
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var newMtx sync.Mutex
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logg.mtx = &newMtx
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mtx.Unlock()
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}
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func (logg *Logger) Debugf(message string, args ...any) {
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logg.printf("debug", message, args...)
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}
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func (logg *Logger) Infof(message string, args ...any) {
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logg.printf("info", message, args...)
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}
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func (logg *Logger) Warningf(message string, args ...any) {
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logg.printf("warning", message, args...)
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}
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func (logg *Logger) Errorf(message string, args ...any) {
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logg.printf("error", message, args...)
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}
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func (logg *Logger) printf(level, message string, args ...any) {
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timestamp := time.Now().Format(time.RFC3339)
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buffer := bytes.NewBuffer([]byte{})
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if logg.subject != "" {
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fmt.Fprintf(buffer, "%s %s.%s: ", timestamp, logg.subject, level)
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} else {
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fmt.Fprintf(buffer, "%s %s: ", timestamp, level)
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}
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fmt.Fprintf(buffer, message, args...)
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fmt.Fprintf(buffer, "\n")
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logg.mtx.Lock()
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fmt.Fprint(output, buffer.String())
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logg.mtx.Unlock()
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}
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